Cooling systems for internal combustion engines



Dec. 22, J L. GRATZMULLER 3,l62,l82

000LING SYSTEMS FOR NTERNAL CoMBUSToN ENGNES Fi1ed Dec. 19 196 '7 Sheetssheet G I RADIATOR P A B C D Dec 22, 1964 J' L. GRATZMULLER 3,l62'l8z COOLING SYSTEMS FOR INTERNAL COMBUSTION ENGNES Fi1ed Dec. 19. 1960 7 Sheetssheet 2 Dec. 22, 1964 J. L. GRATZMULLER 3'l62,l82

COOLING SYSTEMS FOR NTERNAL cOMBUsToN ENGINES F11ed Dec 19 1960 7 Sheets-Sheet 3 FIG- T0 HEA EXCHANGER 64 :LUBR|cANT CIRCUIT Dec. 22, 1964 L. GRATZMULLER 3, 6 8

COOLING SYSTEMS FOR NTERNAL C0MBUSTION ENGNES Filed Decl 19 1960 7 sheetssheet 4I FLow LIMITERS COMPRESSED AIR CONDUIT PRESSURE REDUCER Dec. 22, 1964 J. L. GRATZMULLER 3,l62,l82

COOLING SYSTEMS FOR INTERNAL coMBUsToN ENGINES P THERMORESPO|SIVE SWITCHES Dec. 22, 1964 J. L' GRATZMULLER COOLING SYSTEMS FOR NTERNAL coMBUSToN ENGINES 7 sheets-Sheet 6 Fi1ed Dec. 19 1960 (Z)) said heat exchanger is connected in Said lubricat ing system for the OW of oil through the first 0W path in said heat exchanger;

(c) Said heat exchanger iS connected in said closed liquid cooling circuit for the 0w of liquid through the second ovv path in said heat exchanger;

(j) said rSt 0W path of Sajd heat exchanger and said radiator are connected in series f()r1ling a branch of said closed c00ing1iquid circuit;

(8) Said bypass line iS Connected in parallel across Said br anch;

() Said control valve lneans is connected in Said c10sed cooling liquid circuit to Selectively control the 0w of liquid through Said bypass line and said branch 0W Of liquid 'hrough said bypass line and Said branch; and,

(g) Said ten]perature sensitive valve activating ]leans is 0 eratively connected t() Said contr01 valve nleans to activate the sanle for Selective control of the Ovv of Hquid through Said bypass ne and said branch in 20 accordance vvith the temperature Sensed by said teIn perature sensitive valve activating n1eans References cited in the me of this patent UNITED STATES PATEN,TS

Raddie Dec l Bouton 1Iay l Muir Iuly 29 Muir May 24, Puer Aug. 10 Clapsadle et `al. Oct. 1, Muir Aug 24, Browne Aug lj hlen Ian. 18, Duworth Oct. 11, Holmes e't al Iune 18,

FOREIGN PATENTS Belgium May 14 France Iune 30 

1. A METHOD OF OPERATING A CLOSED COOLING LIQUID CIRCUIT FOR AN INTERNAL COMBUSTION ENGINE, WHICH CIRCUIT INCLUDES A CIRCULATION PUMP, SAID METHOD COMPRISING THE STEPS OF: (A) INDEPENDENTLY OF SAID PUMP, CREATING A SUBSTANTIALLY CONSTANT FLUID PRESSURE, SAID PRESSURE BEING SUFFICIENTLY HIGH TO PREVENT THE FORMATION OF STEAM WITHIN SAID COOLING CIRCUIT UNDER CONDITIONS WHERE THE TEMPERATURE OF THE LIQUID IN THE COOLING CIRCUIT RANGES BETWEEN VALUES ABOVE, AND VALUES BELOW, THE BOILING POINT OF THE LIQUID AT ATMOSPHERIC PRESSURE; (B) APPLYING SAID FLUID PRESSURE TO THE LIQUID IN SAID COOLING CIRCUIT; AND, (C) CONTINUOUSLY MAINTAINING SAID SUBSTANTIALLY CONSTANT FLUID PRESSURE ON SAID LIQUID IN THE COOLING CIRCUIT INDEPENDENTLY OF THE OPERATING TEMPERATURE THEREOF AND INDEPENDENT OF THE SPEED OF THE ENGINE FROM AND INCLUDING ZERO UPWARD TO A MAXIMUM VALUE. 